Improvement in treadle for sewing-machines



UNITED STATES,

HENRY A. CLARK, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN TREADLE FOR SEWiNG-MAKCHINES.

Specification forming part of Letters Patent No. 122,107,

To all persons to whom these presents shall come:

Be it known that I, HENRY A. CLARK, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Sewing-Machines; and that the following description, taken in connection with the accompanying plate of drawings forming a part thereof, is a full and exact speciiication of the same. y

The present invention relates more particularly to the driving of sewingmechanism, and it consists, first, of a treadle or foot-rest, secured to parallel vertical arms that are: hung on a common' center, to have a swinging motion more or less across the wldth of the machine, with one of said vertical arms extended, and connected through" a pitman-rod to and with the driving or balance wheel of the machine. Second, of a frictional driving or intermediate wheel, constructed with the rim or periphery independent of the center hub, but connected therewith through a series of radial pins, moving in and out of radial sockets in the hub, `in each of which is located a spring or elastic cushion to force the said pins outward, thus securing an additional frictonal contact of the wheel with thewheel in connection with which it is to operate, obviating the jamming together of the wheels,V which necessitated the exertion of great power to run them. Third, of a peculiar constructed cam-stop, to prevent backward motion to the machine.

In the accompanying plate of drawings my improvements in sewing-machines are illustrated, Figure l being a"front elevation of a sewing-machine table having the same applied thereto; Fig. 2, a transverse vertical section in plane of line w m, Fig. l; Figs. 3 and 4, vertical sections of the frictional Wheel, respectively, in planes at right angles to each other.v

A in the drawings represents a table or platform, support-ed by parallel uprights B, one at each end. O, the balance or driving-wheel, hung upon a suitable journal, D, of one of the uprights B, so as to be free to turn. E, the foot-rest or treadle, fastened to the ends of parallel arms F F2 that are hung to and upon a comlnon center pin or axis, a, that is arranged within and across the vertical arms G attached to the under side ofthe table A, projecting downward from the same'. One, F2, of the arms F F2, by which the treadle or foot-rest is suspended, is extended beyond the dated December 26, 1871; antedated December 6, 1871.

axis a., and, by the end of its extension H, it is hung to one end of a connecting-rod, I, that, at its other end, is hung to a stud or pin, J, of the wheel C, this stud or pin being located between the center hub and rim of the Wheel.

With a suspension ofthe treadle, suchas above described, in driving the treadle its motion is oi a swinging character, more or less, across the width of the table, the wheel C being driven in consequence thereof through the connection be tween the wheel and treadle herein described.

The principal advantage of this hanging of the treadle--that is, the cross swinging movement o i the treadle over the usual hanging of the treadle or foot-rest--that is, the vertical swing-is, thai the leg of the person is worked more from'thf knee-'j' oint than from the thi gh-j oint, thereby less ening the possibility of injury to the health of th( person, asis obvious.

K is a wheel, arranged, in the present instance to run in frictional contact with the periphery o the wheel Q. This wheel K is secured to a hori zontal shaft, L, arranged to turn in bearing-post; M secured to the upper side of the table; th shaft L being the shaft by and through whicl the sewing mechanism is to be driven by a suit able connectionV of parts; N, the rim ,or periph ery, made of an annular or ring form; and O, th hub ofthe wheelK. The hub O, at several point of its peripheryin the present instance shown a sixis provided with similar sockets b e'xtendini in radial lines .from the "periphery thereof towan the center or axis of the wheel. Within eacl socket b a spiral spring,c, vis located, with a pi or stem, ol, to 'bear thereon, that are severall connected to the inner periphery of the annule rim N, securing thereby the rim N to the hul The connection between the rim and pins d ma be by screwing the pins into the rim, or by forn ing suitable seats in the rim for the pins to se in, or by ,other modes.

With a construction of the wheel K, as abov described, in the running of the same in friction: contact with another wheel, the rim, through tl system of stems and springs, exerts a yielding( elastic pressure on the wheel with which it is rui ning in contact, securing all the frictional coi tact necessary at every point of the revolutic of the wheels, without requiring the wheels tol jammed together.

To secure acloser contact between the Whee t is Well to provide either one or both With a ubber or other elastic tire. In the present in- ;tance it is shoWn as applied to the Wheel K, vhioh, for such purpose, has its rim N construct- :d With a groove or recess, m, entirely around it, nto Which the rubber is placed, projecting be- Vond the depth ofthe anges forming the bound- Jry of such groove or recess.

Having thus described my invention, I shall tate my claims as follows:

l. The treadle or foot-piece E, connected to arallel arms F vF2 suspended on a common axis, y, With one, F2, of said arms extended and conected through rod I With the driving or balance rheel C, constructed, arranged, and operating substantially as described, for the purpose specified. Y

2. The Wheel K, constructed With the rim N and hub O, not contiguous to each other, but

connected together for operation through the d Witnesses:

ALBERT W. BROWN, EDWIN F. BROWN. (134) 

